What I'm far more concerned with than terrorism is the--more and more likely--possibility of burdensome regulations--for instance, all bags being checked just to enter the subway system.   There are enough factors already to consider when using the subway--including Big Sister--it's a female voice-- forever telling us to ask fellow passengers: "Is that bag yours?".   We don't need or want compulsory anti-terrorist measures like the bag-checking.    And I would hope Metro does not in fact want to push more of us to use cars.